MSTEST0054: Use cancellation token from TestContext.CancellationToken

Property	Value
Rule ID	MSTEST0054
Title	Use TestContext.CancellationToken instead of TestContext.CancellationTokenSource.Token
Category	Usage
Fix is breaking or non-breaking	Non-breaking
Enabled by default	Yes
Default severity	Info
Introduced in version	3.11.0
Is there a code fix	Yes

Cause

Accessing CancellationToken via TestContext.CancellationTokenSource.Token instead of using the TestContext.CancellationToken property.

Rule description

MSTest provides a cancellation token through the TestContext.CancellationToken property. Accessing TestContext.CancellationTokenSource is not recommended, and it might be removed in a future release. It's also simpler to use TestContext.CancellationToken compared to TestContext.CancellationTokenSource.Token.

How to fix violations

Use the TestContext.CancellationToken property instead of TestContext.CancellationTokenSource.Token.

For example, change this:

public TestContext TestContext { get; set; }

[TestMethod]
public async Task TestMethod()
{
    await Task.Delay(1000, TestContext.CancellationTokenSource.Token);
}

To this:

public TestContext TestContext { get; set; }

[TestMethod]
public async Task TestMethod()
{
    await Task.Delay(1000, TestContext.CancellationToken);
}

When to suppress warnings

Don't suppress warnings from this rule. The use of CancellationTokenSource property is not recommended and might be removed in a future release.